An artificial date palm stands as a memorial to Warsaw's Jewish community.

A statue honors the children who fought Nazis in Poland.

A simple stone remembers one of the most menacing horses in the Swedish military.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

This hidden collection of everyday objects illustrates life within communist Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A 20th-century picture show in 3-D.

This unusual elevator doesn’t stop or slow down.

The library's graceful rotunda is like a bibliophile's temple.

A modern reimagining of a medieval city gate.

A heated statue pays tribute to one of Sweden's great actresses.

The walls and streets of the ancient city are peppered with penises.

The discovery of an old wall led to the creation of this fascinating museum about the city in the Middle Ages.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

Go surfing on this urban wave, "hacked" by local surfers.

A nearly 25-foot concrete sculpture of Sylvette, Picasso's muse.

This charming pup is meant to celebrate the youth and stubbornness of the city's students.

For over 100 years the most important physicists in the world have autographed this university wall.

An early 19th-century English style garden hidden in the Rotterdam cityscape.

Four giant movable street lights decorate this modern Rotterdam square.

A concrete Picasso in the middle of a student housing complex on the outskirts of Stockholm.

Rotterdammers' dirty minds gave this santa a dirty nickname and cursed it to a life of wandering.

A scale model of the world's largest existing lensed telescope.

This public toilet built in the famous Amsterdam School architectural style is a Dutch national monument.